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摘要
A scintillation crystal fluorescence simulator with a large dynamic range was developed based on a Light-emitting Diode (LED) for calibrating the Bismuth Germanium Oxide(BGO) calorimeter detectors of the Dark Matter Particle Explore Satellite(DMPES). Firstly, a Photo Multiplier Tube(PMT) was used to measure the fluorescent pulse of a BGO crystal, create an exponential model for the shape of fluorescence pulse and to store the exponential waveform into a programmable signal generator. To match the feature of BGO, the LED with a similar peak wavelength to the BGO crystal and a good linearity between current and light intensity was chosen, and the LED driver with a output current in proportion to the input voltage signal was designed. Finally, the signal generator output the simulated fluorescence pulse of BGO crystal to the driver and allowed the LED to lighting, then, it transmitted the pulse to PMTs via an integrating sphere with optical fibers. Experiment results show that the pulse shape from the real BGO is coincident with that from the simulator and the dynamic range of output light intensity covers all three dynodes, which is up to 4.11×103. The simulator satisfies the need of ground-based testing for DMPES BGO detectors and can also be used for other similar scintillation crystal detectors.
- 出版日期2014
- 单位中国科学技术大学
